Which rewriting JSON is best for Java applications? Criteria may vary. I am personally interested in stability and performance.
I am using one from http://www.json.org . Direct link to Java code: http://www.json.org/java/index.html .
The good thing is that it does not require any dependencies. You just need to add seven source files to the project, and you have a JSON constructor.
This works well: http://json-lib.sourceforge.net/
This JsonTools library is very complete. You can find it at Berlios .